Cascais, about 50 minutes by train from Lisbon, has fine sandy beaches - where men in wet suits dive for octopus - and an impressive fish market, where all the fish-sellers are elderly women.
There are frequent trains from Lisbon's Estação Cais do Sodre;
Turismo de Cascais: Rua Visconde da Luz, 2750 Cascais;
tel: 21 486 82 04
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And you can walk all the way back into town along the coast. If you get tired, you're never too far from a railway station.
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